熔解用 코우크스의 不足으로 鑄物熔解用 큐포라에서는 오랫동안 無煙炭을 燃料로 使用하여 왔다. 本 論文에서는 無煙炭만을 熔解用 燃料로하여 約 60時間 操業한 큐포라에서 얻어진 測定値를 가지고 熱精算하여 다음과 같은 結果를 얻었다. 1) 大略 같은 熱風溫度에서 熱風으로 부터 오는 熱量은 混合燃料의 경우 11.50%이고 無煙炭만의 경우 6.35%이었다. 2) 熔湯이 가지는 熱의 경우 混合燃料와 無煙炭은 各各 15.86%와 15.22%이었다. 3) 石灰石分解에 의한 熱損失은 混合燃料의 경우 2.68%이고 無煙炭의 경우 1.68%였다. 4) 爐體蓄熱, 放射傳熱, 造滓 및 其他의 경우는 混合燃料와 無煙炭의 경우 各各 33.53%와 34.49%였다. 5) 爐頂가스中 CO의 燃燒熱은 混合燃料의 경우 35.41%이고 無煙炭만의 경우 39.63%였다. 6) 스라그가 가져가는 熱은 混合燃料의 경우 4.23%이고 無煙炭만의 경우 3.03%였다.

Anthracite has been used as fuel for melting cast iron in the foundry plant because of difficulty of earning good foundry cokes. In this paper, the heat balance of the cupola was calculated with the practical operation data (running time 60.5hrs.) using anthracite in the cupola. The results were compared with the heat balance of the cupola using mixed fuel (anthracite and cokes). And comparisons were made as follow: 1) With approximately same blast temperature, the heat supply by the hot blast to the cupola was 6.35% in case of anthracite while mixed fuel supplied 11.50%. 2) Percent of heat content of the melt had 15.22% in case of anthracite while mixed fuel had 15.86%. 3) Decomposition heat loss by the limestone had 1.68% in case of anthracite while mixed fuel had 2.68%. 4) Heat content in the refractory lining, heat emission, slag formation heat and others had 34.49% in case of anthracite while mixed fuel had 33.53%. 5) Combustion heat value by the CO gas had 39.63% in case of anthracite while mixed fuel had 35.41%. 6) Heat loss percentage by slagging had 3.03% in case of anthracite while mixed fuel had 4.23%.